CA1152116A - Hydraulic shock absorber - Google Patents
Hydraulic shock absorberInfo
- Publication number
- CA1152116A CA1152116A CA000370120A CA370120A CA1152116A CA 1152116 A CA1152116 A CA 1152116A CA 000370120 A CA000370120 A CA 000370120A CA 370120 A CA370120 A CA 370120A CA 1152116 A CA1152116 A CA 1152116A
- Authority
- CA
- Canada
- Prior art keywords
- valve
- cylinder
- disc
- oil
- valve chamber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/06—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using both gas and liquid
- F16F9/08—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using both gas and liquid where gas is in a chamber with a flexible wall
- F16F9/096—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using both gas and liquid where gas is in a chamber with a flexible wall comprising a hydropneumatic accumulator of the membrane type provided on the upper or the lower end of a damper or separately from or laterally on the damper
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/44—Means on or in the damper for manual or non-automatic adjustment; such means combined with temperature correction
- F16F9/446—Adjustment of valve bias or pre-stress
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Fluid-Damping Devices (AREA)
- Axle Suspensions And Sidecars For Cycles (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A hydraulic shock absorber comprising a cylinder containing a working oil; a piston received in a slidable manner in said cylinder and formed with a communication pas-sage for generating a damping force, a piston rod protruding from one end of the cylinder; a valve chamber formed at the other end of the cylinder in fluid communication with the inside of the cylinder; an oil tank having an oil port for communication with the valve chamber; a disc-shaped valve arranged in the valve chamber and formed with a plurality of oil holes which have different effective areas and which can selectively be brought to face the oil port which communi-cates with the valve chamber and oil tank when said disc-shaped valve is turned. The disc-shaped valve is preferably mounted slidably but non-rotatably upon a valve stem. A
coil spring is preferably provided to urge the disc-shaped valve against the valve chamber. At the same-time, the valve stem has its one end protruding to the outside. and a turn knob is mounted on the protruding end of the valve stem for turning the disc-shaped valve. The damping force under compression can be changed without difficulty by turning the turn knob.
A hydraulic shock absorber comprising a cylinder containing a working oil; a piston received in a slidable manner in said cylinder and formed with a communication pas-sage for generating a damping force, a piston rod protruding from one end of the cylinder; a valve chamber formed at the other end of the cylinder in fluid communication with the inside of the cylinder; an oil tank having an oil port for communication with the valve chamber; a disc-shaped valve arranged in the valve chamber and formed with a plurality of oil holes which have different effective areas and which can selectively be brought to face the oil port which communi-cates with the valve chamber and oil tank when said disc-shaped valve is turned. The disc-shaped valve is preferably mounted slidably but non-rotatably upon a valve stem. A
coil spring is preferably provided to urge the disc-shaped valve against the valve chamber. At the same-time, the valve stem has its one end protruding to the outside. and a turn knob is mounted on the protruding end of the valve stem for turning the disc-shaped valve. The damping force under compression can be changed without difficulty by turning the turn knob.
Description
~ 3 TITLE OF THE INVENTION
HYDRAULIC SHOCK ABSORBER
BACKGROUND OF THE INVENTION
Field of the Invention The present invention relates to a hydraulic shock absorber, and more particularly to a hydraulic shock absor~er for use as the rear cushion of an off-the-road motorcycle.
~ Description of the Prior Art In an off-the-road motorcycle, more particularly in .10 a motocross motorcycle, it is desired to change the damping force of the rear cushion under compression in accordance with the road condition or the preference of a driver.
One of the hydraulic shock absorbers made capable of adjusting the damping force under compressian is disclosed in and known from Japanese Utility Model Specification No.
:~54-19890, which was laid open for public inspe~tion on February 8, 1979. This disclosed shock absorber has not ~een used on motocross motorcycles because the adjus~nent of the damping forc~ requires the skills of an experienced -20 service man and, additionally, takes a long time.
~ . .. ... ...... .In the.motoross motorcycle or the like, therefore, .. ~ ... . .. . . . . .. . . . .
a plurality of shock absorbers having different damping . ~ forces are prepared in advance and are replaced in accor-; .
dance with the road condition or the preference of tha driver. According to this current practice, however, con-., -~ : siderable time is wasted in making the replacement~
!
~' ' ' ' ' ' ' SUMMARY OF THE INV~NTION
It is, therefore, an object of the present invention to provide a hydraulic shock absorber which can have its damping force under compression changed with ease.
In accordance with an aspect of the invention there is provided a hydraulic shock absorber comprising a cylinder filled with a working oil; a piston slidably fitted in said cylinder and including damping force generating means; a valve chamber formed at one end of said cylinder and having communication means communicating with the inside of said cylinder; a piston rod protruding from the other end of said cylinder to the outside thereof;
an oil tank having communication means for communication with said valve chamber by way of an oil port in said valve chamber; a first disc-shaped valve in said valve, chamber and formed with a plurality of oil holes which have different effective areas and which have their centers arranged on an identical circle; a valve stem protruding from said first disc-shaped valve to the outside of said cylinder for turning said first disc-shaped valve; whereby said first disc-shaped valve can be turned by turning said valve stem to make a select one of said oil holes face the oil port of said valve chamber.
Further objects, advantages, and features of the present invention will become more fully apparent from a detailed consideration of the arrangement and construction of the constituent parts as set forth in the following specification taken together with the accompanying drawing.
..... .... , . . ,,. . ., ,,,, . ., .. . . . ...... _ ~ _ .. . .. . . . .. .
~' ' :
.
.` ` ~' , .
.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 is a longitudinal section showing one embodiment of the hydraulic shock absorber according to the present invention;
FIG. 2 is a section taken along line II - II of FIG. l; and :~ :
.
, : :
` '. ;' `
~ .
~:, .
~s~ ~
-2a-::, ., "~
.: , , . -, ''' ', ' ~ '" '' , ' "
, -, :,.. ' . .
,. . . . .
FIG. 3 is a graphical presentation illustrating the characteristics of the hydraulic shock absorber according to the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
In FIGS. 1 and 2, a piston 4 formed with a communi-cation passage 3 for generating a damping force is slidably fitted in a cylinder 2 filled with working oil 1. A piston rod 5 protrudes from the lower end of the cylinder, and a disc valve 6 arranged to face the underside of the piston 4 is formed with an orifice 7.
: A diametrically opposed cylindrical valve chamber 8 is disposed at the upper end of the cyl1nder 2 which is con-structed and arranged to communicate with the inside of the cylinder 2 by way of an oil port 9 and which is sealed by . ~
means of a plug 10 fastened to the side o the cylinder 2.
'' One side of the valve chamber 8 is formed with an oil port 11 which provides communication between valve chamber 8 and an oil tank 13 by way of a conduit 12. In the oil tank 13 ' ~ there i9 fitted ~a free piston 14, the back chamber of which is filled with a working gas 15 which is maintained under a suitable ~r,e,s,sure.,,..A.s....a,result., simultaneously with the :~ movements of the piston 4, the aforementioned free piston 14 is moved:to compensate the volumetric change of the piston rod 5 in the inside of the cylinder 2.
A disc-shaped valve 16 is arranged to face the end , of the aforementioned valve chamber 8. The disc-shaped valve . ' ' ,. " ' . -' ' ; ' ' .
16 is formed with a plurality of oil holes 17, 18, 19, and 20which have different effective areas and which have their centers so arranged on an identical circle 20 that a selected one of them may be brought to face the aforementioned oil port 11 by the rotations of disc-shaped valve 16. At the same time, this disc-shaped valve 16 is mounted slidably but not rotatably upon a valve stem 21 which is rotatably fitted in the aforementioned plug 10. A spring 24 urges the afore-mentioned valve 16 onto the end of the valve chamber 8 and is held under tension between said valve 16 and a spring seat 23 which in turn is mounted on the valve stem 21 by means of a snap ring 22. The valve stem 21 has its one end protruding to the outside, and a turn knob 25 formed with position indi-. :~
cating protrusions or the like is mounted on the protruding end of the valve stem 21. In the drawing, reference numerals 26 and 27 indicate an O-ring and a mounting eye, respectively.
In case the hydraulic shock absorber having the construction thus far described is compressed so that the piston 4 i~ moved upward, the valve 6 is opened, as shown in FIG. 1, so that the oil above the piston 4 flows down with ~, relative ease through the communication passage 3. However, the oil corresponding~to the volume replaced by the piston rod~5 inserted into the cylinder 2 is pumped through the oil port 9 and one of the oil holes of the disc-shaped valve 16, e.g., the oil hole 17 (as shown in FIG. 2) into the oil tank : !
~ 13 by way of the conduit 12.
.
~ 4-' ~:, , . . . . ' ' ' . ' - ' ' ' . - ' ~.' :"
~ ~, ' " .
., - , As a result, when the oil passes through the oil hole 17, there is established a damping force sorresponding to the effective area of the oil hole. Thus, a desired damp-ing force can be attained by turning the turn knob 25 to bring one of selected oil holes 17, 18, 19, and 20 having the de-sired effective area into a position to face the oil port 11.
More specifically, if the moving velocity of the piston is denoted at V, the damping forces F under compression, as indi-cated at curves a, b, c and d in FIG. 3, are generated by bringing the oil holes 17, 18, 19, and 20 into the position to face the oil port 11. In the extension stroke of the shock absorber, on the contrary, since the valve 6 is closed, the oil below the piston 4 will flow upward through the orifice 7 to thereby establish a strong damping force. In this in-stance, moreover, tha oil in the tank 13 is supplied into the cylinder 2 so that the valve 16 is shifted to the position shown in dotted lines 16' by the oil pressure transmitted.
As a result, the oil port 11 is opened to ensure the communi-cation with the inside of the cylinder 2 so that little damp-ing force is established at that pvrtion. Thus, t~he dampingforce in the extension stroke is represented by curve e in FIG. 3 independently of the angular position of the valve 16.
In this way, the hydraulic shock absorber according to the present invention can have its damping force under compression adjusted in a remarkably simple and quick manner merely by turning the turn knob. Consequently, proper riding ~ ~J
. . .
comfort can be obtained in accordance with the road condition or the like,especially in the case of the shock absorber of the present invention being used as the rear cushion of a motocross motorcycle. Moreover, since there is no necessity S for providing an adjusting member on the piston, the mechan-ism can be so simplified as to eliminate the fear of any trouble. By filling the oil tank with a gas under high pres-sure, cavitation or the like in the oil is prevented to ensure stable operations.
While the present invention has been described with reference to particular embodiments thereof, it will be under-s~ood that numerous modifications may be made by those skilled in the art without actually departing from the spirit and - scope of the present invention as defined in the appended ~ 15 claims.
:
, ,:
~` ~ 6~ -6-'''`
: ~
'
HYDRAULIC SHOCK ABSORBER
BACKGROUND OF THE INVENTION
Field of the Invention The present invention relates to a hydraulic shock absorber, and more particularly to a hydraulic shock absor~er for use as the rear cushion of an off-the-road motorcycle.
~ Description of the Prior Art In an off-the-road motorcycle, more particularly in .10 a motocross motorcycle, it is desired to change the damping force of the rear cushion under compression in accordance with the road condition or the preference of a driver.
One of the hydraulic shock absorbers made capable of adjusting the damping force under compressian is disclosed in and known from Japanese Utility Model Specification No.
:~54-19890, which was laid open for public inspe~tion on February 8, 1979. This disclosed shock absorber has not ~een used on motocross motorcycles because the adjus~nent of the damping forc~ requires the skills of an experienced -20 service man and, additionally, takes a long time.
~ . .. ... ...... .In the.motoross motorcycle or the like, therefore, .. ~ ... . .. . . . . .. . . . .
a plurality of shock absorbers having different damping . ~ forces are prepared in advance and are replaced in accor-; .
dance with the road condition or the preference of tha driver. According to this current practice, however, con-., -~ : siderable time is wasted in making the replacement~
!
~' ' ' ' ' ' ' SUMMARY OF THE INV~NTION
It is, therefore, an object of the present invention to provide a hydraulic shock absorber which can have its damping force under compression changed with ease.
In accordance with an aspect of the invention there is provided a hydraulic shock absorber comprising a cylinder filled with a working oil; a piston slidably fitted in said cylinder and including damping force generating means; a valve chamber formed at one end of said cylinder and having communication means communicating with the inside of said cylinder; a piston rod protruding from the other end of said cylinder to the outside thereof;
an oil tank having communication means for communication with said valve chamber by way of an oil port in said valve chamber; a first disc-shaped valve in said valve, chamber and formed with a plurality of oil holes which have different effective areas and which have their centers arranged on an identical circle; a valve stem protruding from said first disc-shaped valve to the outside of said cylinder for turning said first disc-shaped valve; whereby said first disc-shaped valve can be turned by turning said valve stem to make a select one of said oil holes face the oil port of said valve chamber.
Further objects, advantages, and features of the present invention will become more fully apparent from a detailed consideration of the arrangement and construction of the constituent parts as set forth in the following specification taken together with the accompanying drawing.
..... .... , . . ,,. . ., ,,,, . ., .. . . . ...... _ ~ _ .. . .. . . . .. .
~' ' :
.
.` ` ~' , .
.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 is a longitudinal section showing one embodiment of the hydraulic shock absorber according to the present invention;
FIG. 2 is a section taken along line II - II of FIG. l; and :~ :
.
, : :
` '. ;' `
~ .
~:, .
~s~ ~
-2a-::, ., "~
.: , , . -, ''' ', ' ~ '" '' , ' "
, -, :,.. ' . .
,. . . . .
FIG. 3 is a graphical presentation illustrating the characteristics of the hydraulic shock absorber according to the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
In FIGS. 1 and 2, a piston 4 formed with a communi-cation passage 3 for generating a damping force is slidably fitted in a cylinder 2 filled with working oil 1. A piston rod 5 protrudes from the lower end of the cylinder, and a disc valve 6 arranged to face the underside of the piston 4 is formed with an orifice 7.
: A diametrically opposed cylindrical valve chamber 8 is disposed at the upper end of the cyl1nder 2 which is con-structed and arranged to communicate with the inside of the cylinder 2 by way of an oil port 9 and which is sealed by . ~
means of a plug 10 fastened to the side o the cylinder 2.
'' One side of the valve chamber 8 is formed with an oil port 11 which provides communication between valve chamber 8 and an oil tank 13 by way of a conduit 12. In the oil tank 13 ' ~ there i9 fitted ~a free piston 14, the back chamber of which is filled with a working gas 15 which is maintained under a suitable ~r,e,s,sure.,,..A.s....a,result., simultaneously with the :~ movements of the piston 4, the aforementioned free piston 14 is moved:to compensate the volumetric change of the piston rod 5 in the inside of the cylinder 2.
A disc-shaped valve 16 is arranged to face the end , of the aforementioned valve chamber 8. The disc-shaped valve . ' ' ,. " ' . -' ' ; ' ' .
16 is formed with a plurality of oil holes 17, 18, 19, and 20which have different effective areas and which have their centers so arranged on an identical circle 20 that a selected one of them may be brought to face the aforementioned oil port 11 by the rotations of disc-shaped valve 16. At the same time, this disc-shaped valve 16 is mounted slidably but not rotatably upon a valve stem 21 which is rotatably fitted in the aforementioned plug 10. A spring 24 urges the afore-mentioned valve 16 onto the end of the valve chamber 8 and is held under tension between said valve 16 and a spring seat 23 which in turn is mounted on the valve stem 21 by means of a snap ring 22. The valve stem 21 has its one end protruding to the outside, and a turn knob 25 formed with position indi-. :~
cating protrusions or the like is mounted on the protruding end of the valve stem 21. In the drawing, reference numerals 26 and 27 indicate an O-ring and a mounting eye, respectively.
In case the hydraulic shock absorber having the construction thus far described is compressed so that the piston 4 i~ moved upward, the valve 6 is opened, as shown in FIG. 1, so that the oil above the piston 4 flows down with ~, relative ease through the communication passage 3. However, the oil corresponding~to the volume replaced by the piston rod~5 inserted into the cylinder 2 is pumped through the oil port 9 and one of the oil holes of the disc-shaped valve 16, e.g., the oil hole 17 (as shown in FIG. 2) into the oil tank : !
~ 13 by way of the conduit 12.
.
~ 4-' ~:, , . . . . ' ' ' . ' - ' ' ' . - ' ~.' :"
~ ~, ' " .
., - , As a result, when the oil passes through the oil hole 17, there is established a damping force sorresponding to the effective area of the oil hole. Thus, a desired damp-ing force can be attained by turning the turn knob 25 to bring one of selected oil holes 17, 18, 19, and 20 having the de-sired effective area into a position to face the oil port 11.
More specifically, if the moving velocity of the piston is denoted at V, the damping forces F under compression, as indi-cated at curves a, b, c and d in FIG. 3, are generated by bringing the oil holes 17, 18, 19, and 20 into the position to face the oil port 11. In the extension stroke of the shock absorber, on the contrary, since the valve 6 is closed, the oil below the piston 4 will flow upward through the orifice 7 to thereby establish a strong damping force. In this in-stance, moreover, tha oil in the tank 13 is supplied into the cylinder 2 so that the valve 16 is shifted to the position shown in dotted lines 16' by the oil pressure transmitted.
As a result, the oil port 11 is opened to ensure the communi-cation with the inside of the cylinder 2 so that little damp-ing force is established at that pvrtion. Thus, t~he dampingforce in the extension stroke is represented by curve e in FIG. 3 independently of the angular position of the valve 16.
In this way, the hydraulic shock absorber according to the present invention can have its damping force under compression adjusted in a remarkably simple and quick manner merely by turning the turn knob. Consequently, proper riding ~ ~J
. . .
comfort can be obtained in accordance with the road condition or the like,especially in the case of the shock absorber of the present invention being used as the rear cushion of a motocross motorcycle. Moreover, since there is no necessity S for providing an adjusting member on the piston, the mechan-ism can be so simplified as to eliminate the fear of any trouble. By filling the oil tank with a gas under high pres-sure, cavitation or the like in the oil is prevented to ensure stable operations.
While the present invention has been described with reference to particular embodiments thereof, it will be under-s~ood that numerous modifications may be made by those skilled in the art without actually departing from the spirit and - scope of the present invention as defined in the appended ~ 15 claims.
:
, ,:
~` ~ 6~ -6-'''`
: ~
'
Claims (7)
1. A hydraulic shock absorber comprising: a cylinder filled with a working oil; a piston slidably fitted in said cylinder and including damping force generating means;
a valve chamber formed at one end of said cylinder and having communication means communicating with the inside of said cylinder; a piston rod protruding from the other end of said cylinder to the outside thereof; an oil tank having communi-cation means for communication with said valve chamber by way of an oil port in said valve chamber; a first disc-shaped valve in said valve chamber and formed with a plurality of oil holes which have different effective areas and which have their centers arranged on an identical circle; a valve stem protruding from said first disc-shaped valve to the outside of said cylinder for turning said first disc-shaped valve;
whereby said first disc-shaped valve can be turned by turning said valve stem to make a select one of said oil holes face the oil port of said valve chamber.
a valve chamber formed at one end of said cylinder and having communication means communicating with the inside of said cylinder; a piston rod protruding from the other end of said cylinder to the outside thereof; an oil tank having communi-cation means for communication with said valve chamber by way of an oil port in said valve chamber; a first disc-shaped valve in said valve chamber and formed with a plurality of oil holes which have different effective areas and which have their centers arranged on an identical circle; a valve stem protruding from said first disc-shaped valve to the outside of said cylinder for turning said first disc-shaped valve;
whereby said first disc-shaped valve can be turned by turning said valve stem to make a select one of said oil holes face the oil port of said valve chamber.
2. A hydraulic cylinder according to claim 1, wherein said oil port in said valve chamber is at one end thereof; the protruding end of said valve stem is equipped with a turn knob, and a spring is positioned on said valve stem for urging said first disc-shaped valve against said valve chamber and toward said oil port in said valve cham-ber communicating with said oil tank.
3. A hydraulic shock absorber according to claim 1, wherein said oil tank receives a free piston separating the working oil and a working gas.
4. A hydraulic shock absorber according to claim 1, wherein said damping force generating means includes a communi-cation passage formed to axially extend through said piston, and a second disc valve arranged to face the underside of said piston and formed with an orifice.
5. A hydraulic shock absorber according to claim 2, wherein said spring is held under tension between said first disc-shaped valve and a spring seat which is mounted on said valve stem.
6. A hydraulic shock absorber according to claim 2, wherein said turn knob is formed with position indicating projections.
7. A hydraulic shock absorber according to claim 2, wherein said first disc-shaped valve is made movable in the diametrical direction of said cylinder while completely ensuring communication between said valve chamber and the inside of said cylinder.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP96291/55 | 1980-07-10 | ||
| JP9629180A JPS5616500A (en) | 1979-07-18 | 1980-07-16 | Manufacture of delta 9*11** and*or delta 166 unsaturated steroid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1152116A true CA1152116A (en) | 1983-08-16 |
Family
ID=14160959
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000370120A Expired CA1152116A (en) | 1980-07-10 | 1981-02-04 | Hydraulic shock absorber |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US4546959A (en) |
| CA (1) | CA1152116A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107504121A (en) * | 2017-09-28 | 2017-12-22 | 浙江路得坦摩汽车部件股份有限公司 | High sensitivity vibration damper with adjustable damping |
Families Citing this family (52)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3816821A1 (en) * | 1988-05-18 | 1989-11-23 | Lisega Kraftwerktech Gmbh | HYDRAULIC SHOCK BRAKE |
| US4872537A (en) * | 1988-06-06 | 1989-10-10 | Brian Warner | Adjustable damper means for shock absorber |
| US4932697A (en) * | 1988-12-29 | 1990-06-12 | Hun Yang C | Brake actuated automatic extending bumper |
| WO1992012892A1 (en) * | 1989-12-18 | 1992-08-06 | Falcon Maritime Ventures, Inc. | Shock absorbing mounting system for high speed watercraft seat |
| US5533586A (en) * | 1994-02-01 | 1996-07-09 | Arctco, Inc. | Adjustable suspension system |
| DE4230237C2 (en) * | 1992-09-10 | 2003-08-21 | Zf Sachs Ag | Hydropneumatic vibration damper with a bottom valve |
| US5988330A (en) * | 1997-07-03 | 1999-11-23 | Morris; Jay | Adjustable shock absorber |
| FR2776731B1 (en) | 1998-03-31 | 2000-05-12 | Donerre Amortisseur | OIL DAMPER ADJUSTMENT DEVICE |
| US6102170A (en) | 1998-05-07 | 2000-08-15 | Tenneco Automotive Inc. | Passive anti-roll system |
| US6360857B1 (en) * | 1999-03-19 | 2002-03-26 | Fox Factory, Inc. | Damping adjuster for shock absorber |
| US6318525B1 (en) * | 1999-05-07 | 2001-11-20 | Marzocchi, S.P.A. | Shock absorber with improved damping |
| US6254067B1 (en) * | 1999-08-02 | 2001-07-03 | Giant Manufacturing Co., Ltd. | Fluid regulating device for use with a hydraulic cylinder to obtain a variable shock absorbing effect |
| US6189897B1 (en) * | 1999-09-07 | 2001-02-20 | Cathy D. Santa Cruz | Steering actuated shock system for vehicles |
| US6659241B2 (en) * | 2001-08-22 | 2003-12-09 | Meritor Heavy Vehicle Technology, Llc | Shock absorber compression damping adjustment |
| US6536818B1 (en) | 2002-05-21 | 2003-03-25 | Nathan S. Moss | Bumper for a motor vehicle |
| US7374028B2 (en) * | 2003-07-08 | 2008-05-20 | Fox Factory, Inc. | Damper with pressure-sensitive compression damping |
| US6880684B1 (en) * | 2003-07-18 | 2005-04-19 | Walker Evans | Flow regulator for a gas shock absorber |
| US20050173849A1 (en) * | 2004-02-10 | 2005-08-11 | Bart Vandewal | Electronically controlled frequency dependent damping |
| US7124865B2 (en) * | 2004-02-13 | 2006-10-24 | Progressive Suspension, Inc. | Pressure regulating dampers |
| US20060225978A1 (en) * | 2005-03-30 | 2006-10-12 | Shoei-Muh Yun | Adjustable shock absorbing device for a front fork of a bicycle |
| US10047817B2 (en) | 2009-01-07 | 2018-08-14 | Fox Factory, Inc. | Method and apparatus for an adjustable damper |
| US8627932B2 (en) | 2009-01-07 | 2014-01-14 | Fox Factory, Inc. | Bypass for a suspension damper |
| US9033122B2 (en) | 2009-01-07 | 2015-05-19 | Fox Factory, Inc. | Method and apparatus for an adjustable damper |
| US8857580B2 (en) | 2009-01-07 | 2014-10-14 | Fox Factory, Inc. | Remotely operated bypass for a suspension damper |
| US9452654B2 (en) | 2009-01-07 | 2016-09-27 | Fox Factory, Inc. | Method and apparatus for an adjustable damper |
| US10060499B2 (en) | 2009-01-07 | 2018-08-28 | Fox Factory, Inc. | Method and apparatus for an adjustable damper |
| US20100170760A1 (en) | 2009-01-07 | 2010-07-08 | John Marking | Remotely Operated Bypass for a Suspension Damper |
| US11306798B2 (en) | 2008-05-09 | 2022-04-19 | Fox Factory, Inc. | Position sensitive suspension damping with an active valve |
| US8393446B2 (en) | 2008-08-25 | 2013-03-12 | David M Haugen | Methods and apparatus for suspension lock out and signal generation |
| US10036443B2 (en) | 2009-03-19 | 2018-07-31 | Fox Factory, Inc. | Methods and apparatus for suspension adjustment |
| US9422018B2 (en) | 2008-11-25 | 2016-08-23 | Fox Factory, Inc. | Seat post |
| US9140325B2 (en) | 2009-03-19 | 2015-09-22 | Fox Factory, Inc. | Methods and apparatus for selective spring pre-load adjustment |
| US10821795B2 (en) | 2009-01-07 | 2020-11-03 | Fox Factory, Inc. | Method and apparatus for an adjustable damper |
| US11299233B2 (en) | 2009-01-07 | 2022-04-12 | Fox Factory, Inc. | Method and apparatus for an adjustable damper |
| US9038791B2 (en) | 2009-01-07 | 2015-05-26 | Fox Factory, Inc. | Compression isolator for a suspension damper |
| US9556925B2 (en) * | 2009-01-07 | 2017-01-31 | Fox Factory, Inc. | Suspension damper with by-pass valves |
| US8936139B2 (en) | 2009-03-19 | 2015-01-20 | Fox Factory, Inc. | Methods and apparatus for suspension adjustment |
| EP2312180B1 (en) | 2009-10-13 | 2019-09-18 | Fox Factory, Inc. | Apparatus for controlling a fluid damper |
| US8672106B2 (en) | 2009-10-13 | 2014-03-18 | Fox Factory, Inc. | Self-regulating suspension |
| US10697514B2 (en) | 2010-01-20 | 2020-06-30 | Fox Factory, Inc. | Remotely operated bypass for a suspension damper |
| EP2402239B1 (en) | 2010-07-02 | 2020-09-02 | Fox Factory, Inc. | Adjustable seat post |
| EP3636953B1 (en) | 2011-05-31 | 2023-09-27 | Fox Factory, Inc. | Apparatus for position sensitive and/or adjustable suspension damping |
| EP2567839B1 (en) | 2011-09-12 | 2019-03-13 | Fox Factory, Inc. | Methods and apparatus for suspension set up |
| US8950558B2 (en) | 2011-12-29 | 2015-02-10 | Fox Factory, Inc. | Dampers with thermal expansion compensation |
| US11279199B2 (en) | 2012-01-25 | 2022-03-22 | Fox Factory, Inc. | Suspension damper with by-pass valves |
| CN103307168B (en) * | 2012-03-07 | 2015-04-08 | 长春孔辉汽车科技有限公司 | Damping-adjustable shock absorber |
| US10330171B2 (en) | 2012-05-10 | 2019-06-25 | Fox Factory, Inc. | Method and apparatus for an adjustable damper |
| WO2016149654A1 (en) | 2015-03-19 | 2016-09-22 | Kynetec Corporation | Recoil shock absorber for long barrel firearms |
| US10737546B2 (en) | 2016-04-08 | 2020-08-11 | Fox Factory, Inc. | Electronic compression and rebound control |
| US10815117B1 (en) * | 2017-08-17 | 2020-10-27 | Knight, Llc | Dual dilution rate closed loop insert |
| CN108071732B (en) * | 2017-08-24 | 2020-04-07 | 深圳市罗伯医疗科技有限公司 | Adjustable hydraulic damper |
| CN108278315B (en) * | 2018-01-15 | 2020-03-06 | 北京东方瑞盛假肢矫形器技术发展有限公司 | Bidirectional adjustable hydraulic joint oil cylinder |
Family Cites Families (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US935329A (en) * | 1908-06-06 | 1909-09-28 | Warren Webster & Co | Valve. |
| US1205433A (en) * | 1915-12-28 | 1916-11-21 | Julius Eisenbrand | Shock-absorber. |
| US1253143A (en) * | 1916-06-19 | 1918-01-08 | Frank Caldwell | Valve for gasolene and other liquid fuels. |
| US2510356A (en) * | 1945-05-15 | 1950-06-06 | Richard A Werts | Flow bean |
| GB941330A (en) * | 1960-02-09 | 1963-11-06 | Fichtel & Sachs Ag | Vibration damper particularly for motor vehicles |
| GB1380900A (en) * | 1970-12-29 | 1975-01-15 | Girling Ltd | Suspension systems |
| US3741229A (en) * | 1971-07-06 | 1973-06-26 | Coleman Co | Safety control valve for propane catalytic heater |
| US3931961A (en) * | 1972-11-20 | 1976-01-13 | Monroe Belgium N.V. | Shock absorber |
| GB1459530A (en) * | 1973-03-08 | 1976-12-22 | Peddinghaus Carl Ullrich Dr | Resilient fluid device |
| DE2507838A1 (en) * | 1975-02-24 | 1976-09-02 | Schiedrum Hydraulik Gmbh & Co | FEED RATE CONTROL DEVICE FOR HYDRAULIC FEED DRIVES |
| US4139182A (en) * | 1975-11-26 | 1979-02-13 | Tokico Ltd. | Spring device |
| US4061320A (en) * | 1976-05-03 | 1977-12-06 | Joe Frank Warner | Two cylinder shock absorber system |
| US4050684A (en) * | 1976-07-19 | 1977-09-27 | Sanders Franklin C | Velocity sensitive dual rate shock strut |
| US4153237A (en) * | 1976-11-01 | 1979-05-08 | Supalla Steven A | Hydrapneumatic suspension unit and valving structure |
| JPS5824336B2 (en) * | 1977-07-13 | 1983-05-20 | ロ−レルバンクマシン株式会社 | Coin wrapping machine wrapping paper cutting device |
| US4159756A (en) * | 1978-01-17 | 1979-07-03 | Kayaba K.K. | Adjusting device for damping force of rear shock-absorbers of motorcycles |
| US4174098A (en) * | 1978-07-03 | 1979-11-13 | Ace Controls, Inc. | Shock absorber and mounting means therefor |
| US4298101A (en) * | 1979-10-05 | 1981-11-03 | Enertrols, Inc. | Shock absorber |
-
1981
- 1981-02-04 CA CA000370120A patent/CA1152116A/en not_active Expired
- 1981-02-13 US US06/234,443 patent/US4546959A/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107504121A (en) * | 2017-09-28 | 2017-12-22 | 浙江路得坦摩汽车部件股份有限公司 | High sensitivity vibration damper with adjustable damping |
Also Published As
| Publication number | Publication date |
|---|---|
| US4546959A (en) | 1985-10-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA1152116A (en) | Hydraulic shock absorber | |
| AU637027B2 (en) | Quick response adjustable shock absorber and system | |
| US5503258A (en) | Hydraulic shock absorber | |
| US4159105A (en) | Shock absorber with adjustable spring load | |
| US5360230A (en) | Damping force control device for suspension system | |
| US4515253A (en) | Damping force generating device for an oil damper | |
| US20020149141A1 (en) | Bicycle damping enhancement system | |
| WO1990002889A1 (en) | Adjustable shock absorber and system | |
| US5152379A (en) | Adjustable shock absorber assembly | |
| US4445673A (en) | Shock absorber and air spring assembly | |
| DE3169409D1 (en) | Seat spring system | |
| US5129489A (en) | Hydraulically operated displacement transmission mechanism for shock absorber with variable damping force | |
| US3810611A (en) | Hydropneumatic suspension unit for a road vehicle | |
| US4524844A (en) | Anti-dive front wheel suspension suitable for motorcycle | |
| US4861068A (en) | Solenoid valve for programmer vehicle suspension system | |
| US4222555A (en) | Hydraulic cushioning device for vehicle seat | |
| US4729538A (en) | Apparatus for hydraulically actuating a vehicle seat | |
| US4793583A (en) | Method and apparatus for hydraulically actuating a vehicle seat | |
| US2918273A (en) | Damped air valve | |
| US4687187A (en) | Oleopneumatic suspension for vehicles, suitable in particular for motorcycles | |
| GB2028425A (en) | Speed Control Governor for Regulating the Maximum Speed of Internal-Combustion Vehicle Engines | |
| CN113474245B (en) | Buffer device | |
| JPH04160242A (en) | Hydraulic shock absorber | |
| US4460073A (en) | Shock absorber with improved back check and anti-dump valve mechanisms | |
| US2032124A (en) | Shock absorber |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |